iPhone connects and disconnects from Mac

Tried connecting when my phone was on ~16%, didn't work until I switched my phone to low power mode. Then connected with no problems. Tried many of the other fixes on this page, that may have led to it finally working on low power mode...

I am having the same issue. But, I have found that it only occurs when my computer is charging. If I disconnect the charging cord, my iPhone stays connected. Not sure why this works, but for some reason it does.

Connect your iPhone

Run this command in Terminal and it will fix all your problems - sudo killall -STOP -c usbd

Also go to System Preferences > Network > You will see iPhone USB 1, 2 etc. - Select each one and remove them all by pressing the ( - symbol) in the bottom left corner.

Disconnect and reconnect and this should fix all your issues.

It took a bit more than 51%, but this worked for me. I think I charged it up to 70% on my charger before moving it to my iMac, and that ended the eternal connect/disconnect it had been doing previously when I was plugging it into the iMac. I've seen similar behaviour on my car charger so now my suspicion is that the car charger just doesn't have enough juice for a heavily discharged phone. Interesting. Thanks very much for the helpful comment. 🙂

I had issues connecting my new (to me) iphone XS to my macbook pro running High Sierra (becasue I love how solid it runs). None of teh suggestions helped so I manually downloaded and reinstalled iTunes and when I did it told me I needed an extra update to make my iphone work with it. Suddenly everything started working. You can manually download iTines here - https://support.apple.com/kb/dl1977?locale=en_GB

I have a Mid 2015 Macbook pro 15 inch and had so many problems with my iphone continually connecting and disconnecting This "sudo killall -STOP -c usbd" works and I use it every time I use image capture.

Thank you!

This terminal command also worked for me! Much thanks! I've struggled with this for a long long time! And currently I have a failed battery on my Mid 2015 MBPro Retina so only running off of the external power supply and I can still charge my phone now! Thanks again (in this case to: rpmartins) for providing answers to keep us all going!

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Originally posted by rpmartins:

Try terminal :

sudo killall -STOP -c usbd

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Peace!

slashGW

I bought an USB Hub with an external power supply, that did the trick for me. No need for an extra cable or change some strange software settings.

Tried many of the solutions offered, but charging my IphoneX more than 60% worked for me. Once it hit that mark, I could get it to connect continuously to my 2015 MacBook Pro.

sudo killall -STOP -c usbd worked for me. Thank you! Such an irritating thing to be happening!

I switched my phone to airplane mode and then it's stopped connecting/disconnecting rapidly.

I've also tried all this, too. Only way I can get it to connect is using the activity monitor workaround.

Plugging my 7plus into this mid 2015 retina Pro, and waiting for it to start its incessant beeping, then opening activity monitor and force quit usbd makes it connect.

but - it doesn't 'properly' connect. phone is charging, but doesn't show up in photos to import. which is what I wanted to to really.

I was having this exact issue and my brother and I tried ever troubleshooting thing you could think of and nothing would work. I finally tried again just for the sake of it after my phone was had charged up some and it now connects with no problem! When I was initially trying to connect my phone was close to dying and only had about 13% remaining, but after I got 50+% CHARGED no issues what so ever!

I HOPE THIS HELPS SOMEONE!!!

:)

This has happened to me so many times and I could never pinpoint the variables until this super helpful post! Thank you to all that have weighed in on this.

Here's what consistently works for me nowadays with my iphone7. If my phone is charged above 50% and my phone disconnects, then I need to delete the "usbd" process from the Activity Monitor on the receiving computer. If my phone is charged below 50% (and that battery indicator is not always that accurate), then charging my phone works. I did not realize that the power level on my phone would make a difference, but it does.

I also am having this issue when connecting both my iPad Mini 4 and iPhone XS, and killing the usbd process on my Macbook Pro also solves it.

But here's an unexpected twist: I only see the problem when using the lightning cables from those devices. If I use a lightning cable from my iPhone 6, it works fine every time, without having to kill the usbd process.

Can anyone else reproduce that? If so, maybe it's being caused by a characteristic of newer lightning cables?